fastmcp
The fast, Pythonic way to build MCP servers and clients.
Decision gist · record as of 2026-08-14
Yes. FastMCP is actively maintained with a recent release, has zero known vulnerabilities, and uses a permissive Apache-2.0 license. Low install friction and clear documentation make it a practical choice for anyone building MCP servers or integrating LLMs with Python tools. The framework is production-ready and backed by Prefect.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Requires Python 3.10 or later.
- Low friction installation as a pure Python wheel.
- Actively maintained with a release 4 days ago; the project is in the top 1000 on PyPI and is incorporated into the official MCP Python SDK.
License · maintenance · safety
Apache-2.0 (permissive) — Apache-2.0 (permissive) allows commercial use, modification, and distribution with minimal restrictions—suitable for most production scenarios.
last release 2026-08-10 (4 days) · last repo commit 2026-08-14 · 27,207 stars
0 known vulnerabilities (OSV.dev, 2026-08-14) · 88,710,190 downloads/mo, #384 on PyPI
Alternatives
Verify before relying
pip install fastmcp
from fastmcp import FastMCP
mcp = FastMCP("Demo")
@mcp.tool
def add(a: int, b: int) -> int:
"""Add two numbers"""
return a + b
if __name__ == "__main__":
mcp.run()- Whether fastmcp-slim (the runtime dependency) is a lighter variant or a required companion package.
- Specific transport and authentication mechanisms supported beyond 'protocol lifecycle management'.
- Whether the framework handles both synchronous and asynchronous tool definitions.
- Exact monthly download volume and current adoption metrics.
What it is and what it does
FastMCP is a production-ready Python framework for building Model Context Protocol servers, clients, and applications. It wraps Python functions into MCP-compliant tools, resources, and prompts with automatic schema generation, validation, and documentation. The framework handles protocol negotiation, authentication, and lifecycle management, allowing developers to focus on business logic rather than MCP infrastructure.
The package is designed for three use patterns: servers that expose tools to LLMs, clients that connect to any MCP server locally or remotely, and apps that render interactive UIs directly in conversations. It supports Python 3.10, 3.11, 3.12, and 3.13, and is actively maintained by Prefect with incorporation into the official MCP Python SDK.
Use it for
- Build an MCP server that exposes custom Python functions as tools for LLMs to call.
- Create a client that connects to remote MCP servers and manages protocol handshakes automatically.
- Develop an interactive application that renders tool UIs directly within an LLM conversation.
- Prototype and deploy MCP-based agents without writing low-level protocol code.
- Integrate existing Python business logic into an LLM ecosystem with minimal boilerplate.
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes.
FastMCP is actively maintained with a recent release, has zero known vulnerabilities, and uses a permissive Apache-2.0 license. Low install friction and clear documentation make it a practical choice for anyone building MCP servers or integrating LLMs with Python tools. The framework is production-ready and backed by Prefect.
Install
fastmcp on PyPI
Before you install
Low friction installation as a pure Python wheel. Actively maintained with a release 4 days ago; the project is in the top 1000 on PyPI and is incorporated into the official MCP Python SDK. Requires Python 3.10 or later.
Requires Python 3.10 or later.
License in practice
Apache-2.0 (permissive) allows commercial use, modification, and distribution with minimal restrictions—suitable for most production scenarios.
Quickstart
pip install fastmcp
from fastmcp import FastMCP
mcp = FastMCP("Demo")
@mcp.tool
def add(a: int, b: int) -> int:
"""Add two numbers"""
return a + b
if __name__ == "__main__":
mcp.run()Verify before relying
- Whether fastmcp-slim (the runtime dependency) is a lighter variant or a required companion package.
- Specific transport and authentication mechanisms supported beyond 'protocol lifecycle management'.
- Whether the framework handles both synchronous and asynchronous tool definitions.
- Exact monthly download volume and current adoption metrics.
Package facts
| License | Apache-2.0 permissive |
| Python support | Supports the current Python release >=3.10 |
| Install friction | Low. Pure-Python wheel |
| Runtime dependencies | 1 packagefastmcp-slim |
| Maintenance | Actively maintained 4 days since the last release |
| Last repo commit | |
| First released | |
| Downloads | 88,710,190 / month, #384 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
| Classifiers | Intended Audience :: DevelopersLicense :: OSI Approved :: Apache Software LicenseProgramming Language :: Python :: 3.10Programming Language :: Python :: 3.11Programming Language :: Python :: 3.12Programming Language :: Python :: 3.13Topic :: Scientific/Engineering :: Artificial IntelligenceTyping :: Typed |
Evidence: fastmcp-3.4.7-py3-none-any.whl
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See also fastmcp-extensions · fastmcp-slim · workspace-mcp · mcp-use · langchain-mcp-adapters · fast-agent-mcp · mcp · tilt-mcp · mcp-atlassian · jupyter-server-mcp